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Showing 1 to 20 of 126 for “"Zwitterionic"”.
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A study of zwitterionic adducts of TCNQ.
Chapter 1 gives a general introduction to the field of electroactive organic compounds. The historical development of the field is outlined and then the more specific areas are described in detail. The properties of picolinium and quinolinium TCNQ salts are introduced and the extension of this to …
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Chemical recycle of polyester waste using novel zwitterionic catalysts
… from drink bottles wasdepolymerized using novel zwitterionic imidazolium-2-carboxylate salts ascatalysts (or catalyst-precursors) in the presence of ethylene glycol viaglycolysis to give bis(hydroxyethyl)terephthalate (BHET). The influence ofreaction temperature, glycolysis time, ethylene …
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Developing Low Fouling Peptides and Zwitterionic Materials for Biomedical Applications
… of efforts aimed at developing mixed charge and zwitterionic materials to prevent biofouling in biomedical applications. Peptides are considered for use as natural low fouling materials due to their biocompatibility, diverse chemical properties, well-defined sequence, and biodegradability. Low …
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CERBERUS-TYPE TRISANIONIC TRISNHC AND ITS ZWITTERIONIC GOLD AND SILVER COMPLEXES
… of homotrimetallic systems. The resulting zwitterionic metal complexes of type [(MPPh)<sub>3</sub>(NHC)] (M = Au or Ag) have been fully characterized by spectroscopic techniques, as well as elemental analysis. To our knowledge, this NHC is the first trisanionic Cerberus-type NHC to be …
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Synthesis and Evaluation of Biological Activity of a Potential Immunomodulatory Zwitterionic Polysaccharide
… thus far, out of which two were found to be zwitterionic polymers, PSA1 and PSA2. PSA1 was found to stimulate T-cell lineage of the immune system because of the dual charge structural feature of the molecule.</p> <p>This dissertation discusses about the synthesis of a PSA1 analogue and …
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Nanocomposites: Incorporation of Cellulose Nanocrystals into Polymers and Addition of Zwitterionic Functionality
… chemistry, and finally functionalized with a zwitterionic group by β-propiolactone ring opening. Amine coupling was confirmed with X-ray photoelectron spectroscopic analysis, and a second carboxylic acid peak was confirmed using infrared spectroscopy. These results were further verified with …
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Conjugation of Zwitterionic and Cationic Peptides to Lipid and Polymer for Gene Delivery
… on 3 types of conjugates mainly. They are the zwitterionic peptide (EK)x pair lipid DSPE conjugates, THE DSPE-(EK)x, the cationic ionizable peptide RxHy lipid DSPE conjugates, the DSPE-RxHyC, and the cationic ionizable peptide RxHyC polysaccharide sugar mannan conjugates, the RxHyC-mannan. Such …
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Synthesis and molecular properties of zwitterionic adducts of TCNQ and other related compounds
… trafluoro-7,7,8,8-tetracyanoquinodimethane) based zwitterionic D-1t-A materials (where D and A are electron donors and acceptors respectively) of which the methylated Z-~-(N-methyl-4-quinolinium)-a-cyano-4( 2,3,5,6-tetrafluoro)styryldicyanomethanide [CH3(4)Q3CNQF4] is a typical example. Synthetic …
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Preparation and Biocompatibility of Electrospun Zwitterionic Poly(Sulfobetaine Methacrylate) for Wound Dressing Applications
… viscosity, molecular weight, and concentration.Zwitterionic PSBMA has been well studied for its superhydrophilic and ultralow biofouling properties, making it a promising material for superabsorbent and nonadherent wound dressings. Electrospinning provides multiple desirable features for wound …
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DEVELOPMENT OF A 3D ZWITTERIONIC HYDROGEL SYSTEM FOR CELL CULTURE AND EXTRACELLULAR VESICLES
… research has shown the effectiveness of 3D zwitterionic scaffolds in supporting the growth of suspension hematopoietic stem and progenitor cells, the application of hydrogels for 3D culturing of EV-producing cells like human embryonic kidney (HEK) cells and neutrophils has not been …
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Interfacial properties of grafted zwitterionic polymers and interaction with proteins at the nanoscale
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2022-04-06 without embargo terms
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Dianionic Janus-Type N-Heterocyclic Carbenes and their Zwitterionic Gold and Silver Metal Complexes
… to two coinage metals. The resulting zwitterionic metal complexes of type [(Ph<sub>3</sub>P)M(NHC)M(PPh<sub>3</sub>)] (M = Au, Ag) have been fully characterized by spectroscopic techniques and X-ray crystallography. One of the new ligands positions the two metal centers at a distance …
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Toward the Synthesis of Trianionic Cerberus-Type N-Heterocyclic Carbenes and their Zwitterionic Gold and Silver Complexes
… in situ by deprotonation of the corresponding zwitterionic salt with KHMDS. The free carbene was characterized by <sup>1</sup>H and <sup>13</sup>C NMR spectroscopy. The corresponding thione was obtained by addition of excess sulfur to the in situ generated carbene. The utility of the new …
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The Effect of The Modification of The Acidic and Zwitterionic Phospholipid Composition on The Enzymatic Activity of D-Beta-Hydroxybutyrate Dehydrogenase
… composition. This enzyme hydrolyzed primarily zwitterionic phospholipids to phosphatidic acid, an acidic phospholipid. The accumulation of phosphatidic acid increases the electrostatic potential at the surface of the membrane. The apparent K(,m) for the negatively charged substrates of BDH …
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The Design, Synthesis, and Evaluation of Zwitterionic and Cationic Lipids for In Vivo RNA Delivery and Non-Viral CRISPR/Cas Gene Editing
… in vivo RNA delivery capabilities to the lung: zwitterionic amino lipids (ZALs) and cationic sulfonamide amino lipids (CSALs). ZALs contain an amine rich core, hydrophobic tails introduced via conjugate addition or epoxide opening, and a zwitterionic sulfobetaine head group. ZALs were designed …
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The investigation of ion-exchange properties of novel zwitterionic and amphoteric stationary phases and their application to the separation of inorganic and organic ions
… and ion-exchange groups. The main advantage of zwitterionic ion-exchangers is the possibility of their use for the simultaneous separation of catlons and anlons and the use of diluted elucnts, which significantly increases the sensltlvlty of detection and can contribute to the increased …
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Anion-induced zwitterion formation in gas-phase arginine
… naturally occurring amino acids are known to be zwitterionic in solution, whereas most adopt canonical structures in the gas-phase. However, complexation with solvent molecules and cations can induce zwitterion formation. This thesis presents experimental and theoretical results that provide …
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Extraction, transport, and transformation of poly- and perfluoroalkyl substances in soils impacted by aqueous film-forming foam
… of diverse PFAS classes, including anionic, zwitterionic, and cationic structures. Many of the polyfluorinated substances have been shown to transform to the perfluorinated substances in the environment. Despite years of research concerning the mostly perfluorinated anionic substances, the …
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Synthesis and Characterization of Well-Defined Heterobifunctional Polyethers for Coating Magnetite and Their Applications in Biomedicine Resonance Imaging
… included carboxylates, alkylammonium ions, and zwitterionic phosphonates. The anchor group-magnetite bond stability was investigated in water and phosphate buffered saline (PBS). Through these studies, the zwitterionic phosphonate group was shown to be a better anchoring group for magnetite than …
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Contributions to the chemistry of higher-coordinate Silicon : synthesis, structure, and stereodynamics of new Silicon(IV) complexes with SiO2N2C, SiO4C, or SiO6 skeletons
… and hexacoordinate silicon.The spirocyclic zwitterionic Lambda5Si-silicates 1–6 with a (2,2,6,6-tetramethylpiperidinio)- methyl group and two identical bidentate chelate ligands derived from glycine, (S)-alanine, (S)-phenylalanine, (S)-valine, (S)-tert-leucine, or (S)-proline bound to the …
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